Dual-frequency antenna

Abstract

A dual-band antenna includes a substrate, a first antenna unit, a second antenna unit and a feed body. The substrate comprises a first surface and a second surface which are opposite. The first antenna unit operates in a first frequency band and is arranged on the first surface. The first antenna unit comprises a feed-in radiation sheet, a plurality of transmission radiation sheets and an annular radiation sheet. The plurality of transmission radiation sheets are connected with the feed-in radiation sheet, and each transmission radiation sheet extends outwards from the feed-in radiation sheet towards a direction far away from the feed-in radiation sheet. The annular radiation sheet is connected with the transmission radiation sheets and is provided with a plurality of hole grooves. The hole grooves are in a sawtooth shape or a semi-sine wave shape. The second antenna unit operates in a second frequency band and is arranged on the second surface. The feed body includes a feed-in portion and a ground portion. The feed-in part is electrically connected with the second antenna unit. The grounding part is electrically connected with the feed-in radiation sheet. The size of the dual-band antenna can be reduced at a low frequency band, so that the size is greatly saved, and the antenna radiation efficiency characteristics of the first frequency band and the second frequency band are maintained.

Description

Technical Field

[0001] This utility model relates to an antenna, and more particularly to a dual-band antenna applicable to dual frequency bands. Background Technology

[0002] Wi-Fi (wireless network) has become widely used in people's lives. With the increasing usage and speed demands of Wi-Fi, the frequency bands currently covered by Wi-Fi include 2.4GHz, 5GHz, and 6GHz, with 2.4GHz and 5GHz being the primary bands in use. Generally, Wi-Fi routers or Wi-Fi sharing devices require antennas that support at least two frequency bands: 2.4GHz and 5GHz. On the other hand, with the trend towards miniaturization in electronic products, reducing the size of components such as antennas has always been a goal for related industries. Utility Model Content

[0003] At least one embodiment of this utility model provides a dual-band antenna that can operate in a first frequency band and a second frequency band. The dual-band antenna can reduce its size in the low-frequency band, significantly saving space while maintaining the antenna radiation efficiency characteristics in both the first and second frequency bands.

[0004] The dual-band antenna provided in at least one embodiment of this utility model includes a substrate, a first antenna element, a second antenna element, and a feed element. The substrate includes opposing first and second surfaces. The first antenna element operates in a first frequency band and is disposed on the first surface. The first antenna element includes a feed radiator, a plurality of transmission radiators, and a ring radiator. The plurality of transmission radiators are connected to the feed radiator, and each transmission radiator extends outward from the feed radiator in a direction away from the feed radiator and has a remote end away from the feed radiator. The ring radiator connects to these remote ends and has a plurality of slots. The feed radiator and the transmission radiators are located within the ring radiator. Each slot is serrated or semi-sine wave shaped. The second antenna element operates in a second frequency band and is disposed on the second surface. The feed element includes a feed portion and a ground portion. The feed portion is electrically connected to the second antenna element. The ground portion is electrically connected to the feed radiator.

[0005] In at least one embodiment of this invention, the number of these slots is the same as the number of these transmitting radiation sheets.

[0006] In at least one embodiment of this invention, the feed radiation plate is circular in shape. These transmitting radiation plates are connected at equal intervals to the circumference of the feed radiation plate.

[0007] In at least one embodiment of this invention, the second antenna unit includes multiple radiating branches, multiple first arc-shaped radiating plates, and multiple second arc-shaped radiating plates. Each radiating branch includes a first extension section, a second extension section, a third extension section, and a bent section, and has a feed end and a connecting end. In each radiating branch, the first and second extension sections extend in the same direction. The third and second extension sections extend in different directions. The bent section connects the first and second extension sections, and the second extension section connects the bent section and the third extension section. The feed end is located at the end of the first extension section away from the bent section. The connecting end is located at the end of the third extension section away from the second extension section. In these radiating branches, these feed ends are connected to each other and to the feed portion. The multiple first arc-shaped radiating plates are respectively connected to these connecting ends. The multiple second arc-shaped radiating plates are respectively located between two adjacent third extension sections and are spaced apart from these first arc-shaped radiating plates. The shapes of these first and second arc-shaped radiating plates form an annulus with multiple notches.

[0008] In at least one embodiment of this invention, the bent segment in each radial branch is sine wave shaped.

[0009] In at least one embodiment of this invention, in each radial branch, the bent segment is serrated. The bent segment has multiple serrated portions. Each serrated portion has an endpoint. Any two adjacent endpoints are located on opposite sides of the connection between the first extension segment and the second extension segment.

[0010] In at least one embodiment of the present invention, the number of the first arc-shaped radiating plates, the number of the second arc-shaped radiating plates, and the number of the transmitting radiating plates are all the same.

[0011] In at least one embodiment of the present invention, the feed end of the radiation branch is aligned with the central region of the feed radiation plate.

[0012] In at least one embodiment of this invention, each first arc-shaped radiating sheet has a first arc length. All of these first arc lengths are equal. Each second arc-shaped radiating sheet has a second arc length. All of these second arc lengths are equal.

[0013] In at least one embodiment of this utility model, the distance between any two adjacent connection ends is equal. Attached Figure Description

[0014] To gain a more complete understanding of the embodiments and their advantages, the following description is made with reference to the accompanying drawings, wherein:

[0015] Figure 1 This is a top view of a dual-frequency antenna according to some embodiments of the present invention;

[0016] Figure 2 for Figure 1Side view of a dual-band antenna;

[0017] Figure 3 for Figure 1 A schematic diagram of the first antenna element of a dual-band antenna;

[0018] Figure 4 for Figure 1 A schematic diagram of the second antenna element of a dual-band antenna;

[0019] Figure 5 This is a top view of a dual-frequency antenna according to another embodiment of the present invention;

[0020] Figure 6 for Figure 5 A schematic diagram of the first antenna element of a dual-band antenna;

[0021] Figure 7 for Figure 5 A schematic diagram of the second antenna element of a dual-frequency antenna.

[0022] Figure label:

[0023] 100A, 100B: Dual-band antenna

[0024] 200:Substrate

[0025] 210: First Surface

[0026] 220: Second Surface

[0027] 300: First antenna element

[0028] 310: Feed radiation plate

[0029] 320: Transmitting radiation sheet

[0030] 321: Adjacent End

[0031] 322: Remote end

[0032] 330: Circular Radiation Plate

[0033] 331A, 331B: Hole and slot

[0034] 400: Second Linear Unit

[0035] 410: Radial Branch

[0036] 411: First extension

[0037] 412: Second extension

[0038] 413: Third extension

[0039] 414A, 414B: Bend Section

[0040] 415: Feed-in end

[0041] 416: Connector

[0042] 417: Serrated section

[0043] 420: First arc-shaped radiating plate

[0044] 430: Second arc-shaped radiating plate

[0045] 500: Feeder

[0046] 510: Feeding Department

[0047] 520: Grounding part

[0048] l 1,l 2,l 2',l 3,l 3',l 4,l 4',la,l a',ld,l d': length

[0049] r1, r2: radius

[0050] w1, w2, w3, w4: Width

[0051] θ1, θ1', θ2, θ2', θ3, θ3': central angle

[0052] X, Y, Z: Direction Detailed Implementation

[0053] The embodiments of this utility model are discussed in detail below. However, it is understood that the embodiments provide many applicable concepts that can be implemented in a wide variety of specific situations. The discussed and disclosed embodiments are for illustrative purposes only and are not intended to limit the scope of this utility model.

[0054] Figure 1 This is a top view of a dual-band antenna 100A according to some embodiments of the present invention, and Figure 2 for Figure 1 Side view of the 100A dual-band antenna. (See attached image) Figure 1 and Figure 2 The dual-band antenna 100A includes a substrate 200, a first antenna element 300, a second antenna element 400, and a feed element 500. This dual-band antenna 100A can be applied to devices using Wi-Fi technology, but is not limited thereto.

[0055] Figure 3 and Figure 4 They are respectively Figure 1 A schematic diagram of the first antenna element 300 and the second antenna element 400 of the dual-band antenna 100A. (See diagram below.) Figures 1 to 4As shown, the substrate 200 includes a first surface 210 and a second surface 220 opposite each other in the Z direction. The substrate 200 may be cylindrical, while the first surface 210 and the second surface 220 may be circular. The substrate 200 may be a glass fiber substrate with a dielectric loss tangent of 0.0025, a relative permittivity of 4.4, and a thickness of 1.6 millimeters (mm).

[0056] The first antenna element 300 may be a copper sheet and is disposed on the first surface 210. The area of ​​the first surface 210 is larger than the area of ​​the first antenna element 300 covering the first surface 210. The first antenna element 300 includes a feed radiating sheet 310, a plurality of transmission radiating sheets 320 and a ring radiating sheet 330.

[0057] The feed radiator 310 is generally circular in shape. Each transmit radiator 320 is generally rectangular in shape and has an adjacent end 321 connecting to the feed radiator 310 and a remote end 322 away from the feed radiator 310. Each transmit radiator 320 extends outward from the feed radiator 310 in a direction away from the feed radiator 310; for example, these transmit radiators 320 radiate outward from the feed radiator 310 as a center. These transmit radiators 320 are evenly distributed on the circumference of the feed radiator 310. In other words, these transmit radiators 320 are connected to the circumference of the feed radiator 310 at equal intervals. Figure 1 In the example, the first antenna element 300 includes four transmission radiating plates 320, two of which are parallel to the X direction and the other two are parallel to the Y direction, but are not limited thereto.

[0058] The annular radiating plate 330 is roughly annular in shape. The inner circumference of the annular radiating plate 330 connects to the furthest end 322 of each transmitting radiating plate 320, such that the feed radiating plate 310 and the plurality of transmitting radiating plates 320 are all located within the annular radiating plate 330. Specifically, the annular radiating plate 330 has a plurality of slots 331A. The number of these slots 331A is the same as the number of transmitting radiating plates 320. Each slot 331A is located between two adjacent transmitting radiating plates 320. The opening cross-section of the slot 331A in the normal direction (parallel direction Z) of the first surface 210 is semi-sine wave shaped.

[0059] Similar to the first antenna element 300, the second antenna element 400 can also be a copper sheet and is disposed on the second surface 220. The area of ​​the second surface 220 is slightly larger than the area covered by the second antenna element 400 on the second surface 220. The second antenna element 400 includes multiple radiating branches 410, multiple first arc-shaped radiating plates 420, and multiple second arc-shaped radiating plates 430.

[0060] Each radial branch 410 includes a first extension 411, a second extension 412, a third extension 413, and a bent segment 414A. The first extension 411, the second extension 412, and the third extension 413 are all elongated in the normal direction (direction Z) of the second surface 220, while the bent segment 414A is sine-wave shaped in the direction (direction Z) of the second surface 220. Figure 1 In the example, the bend 414A has a crest and a trough.

[0061] Furthermore, the first extension segment 411 and the second extension segment 412 extend in the same direction, while the third extension segment 413 extends in a different direction than the first extension segment 411 and the second extension segment 412. For example, the extension direction of the third extension segment 413 may be perpendicular to the extension direction of the second extension segment 412. The bend segment 414A connects the first extension segment 411 and the second extension segment 412, while the second extension segment 412 connects the bend segment 414A and the third extension segment 413. In addition, each radial branch 410 has a feed end 415 and a connecting end 416. The feed end 415 is located at the end of the first extension segment 411 away from the bend segment 414A, while the connecting end 416 is located at the end of the third extension segment 413 away from the second extension segment 412. In these radial branches 410, the feed ends 415 are connected to each other and are located at the center of the second surface 220. In other words, the first extension segments 411 of these radial branches 410 are connected to each other at the center of the second surface 220.

[0062] Multiple first arc-shaped radiating plates 420 are spaced apart from each other and are respectively connected to the connection ends 416 of the radiating branches 410. Therefore, the number of first arc-shaped radiating plates 420 is the same as the number of radiating branches 410. Multiple second arc-shaped radiating plates 430 correspond to multiple first arc-shaped radiating plates 420. That is, the number of second arc-shaped radiating plates 430 is also the same as the number of first arc-shaped radiating plates 420 or radiating branches 410. Multiple second arc-shaped radiating plates 430 are respectively located between two adjacent third extension segments 413 and are spaced apart from the first arc-shaped radiating plates 420. In other words, each second arc-shaped radiating plate 430 is located between one of the third extension segments 413 and one of the first arc-shaped radiating plates 420, and is spaced apart from both the third extension segment 413 and the first arc-shaped radiating plate 420.

[0063] Furthermore, the distance between the connecting ends 416 of any two adjacent radiating branches 410 is equal. Each first arc-shaped radiating plate 420 has a first arc length, and the first arc lengths of the plurality of first arc-shaped radiating plates 420 are all equal. Each second arc-shaped radiating plate 430 has a second arc length, and the second arc lengths of the plurality of second arc-shaped radiating plates 430 are all equal. The width of each first arc-shaped radiating plate 420 may be equal to the width of each second arc-shaped radiating plate 430. The first arc-shaped radiating plates 420 and the second arc-shaped radiating plates 430 surround the third extension 413. Therefore, the shapes of these first arc-shaped radiating plates 420 and these second arc-shaped radiating plates 430 form an annulus with multiple notches. The distance between each second arc-shaped radiating plate 430 and the adjacent third extension 413 is equal, and the distance between each second arc-shaped radiating plate 430 and the adjacent first arc-shaped radiating plate 420 is also equal. The number of the first arc-shaped radiating sheet 420, the number of the second arc-shaped radiating sheet 430, and the number of the transmission radiating sheet 320 are all the same.

[0064] exist Figure 1 In the example, the vertical projections (projections in direction Z) of the first extensions 411 and portions of the bends 414A are located within the vertical projection (projection in direction Z) of the feed radiator 310. Specifically, the feed end 415 of the radiating branch 410 is aligned with the central region of the feed radiator 310. That is, the vertical projection of the feed end 415 overlaps with the vertical projection of the central region of the feed radiator 310. The vertical projections of the second extensions 412 are respectively located within the vertical projections (projections in direction Z) of the transmission radiators 320. Specifically, the vertical projections of the first arcuate radiators 420 and the second arcuate radiators 430 at least surround the vertical projection of a portion of the annular radiator 330. Furthermore, the surfaces of the first antenna element 300 and the second antenna element 400 may each be coated with a layer of waterproof insulating varnish (not shown) to protect the first antenna element 300 and the second antenna element 400.

[0065] The feed unit 500 includes a feed section 510 and a ground section 520. The feed section 510 is electrically connected to the feed terminal 415 of the second antenna unit 400, while the ground section 520 is electrically connected to the feed radiating plate 310 of the first antenna unit 300 and the ground of the applied device. For example, the feed unit 500 can be a coaxial cable and a coaxial cable connector. The coaxial cable connector can pass through the substrate 200, the first antenna unit 300, and the second antenna unit 400, and the center conductor of the coaxial cable connector is electrically connected to the feed terminal 415 of the second antenna unit 400, while the outer conductor of the coaxial cable connector is electrically connected to the feed radiating plate 310 of the first antenna unit 300. The feed signal is transmitted via the coaxial cable to the coaxial cable connector, and then to the first antenna unit 300 and the second antenna unit 400.

[0066] In detail, the feed signal is transmitted via the feed element 500 to the first antenna element 300 and the second antenna element 400. The first antenna element 300 can be excited in a first frequency band to radiate electromagnetic waves, while the second antenna element 400 can be excited in a second frequency band to radiate electromagnetic waves. The first frequency band is lower than the second frequency band, and the range of the first frequency band is, for example, from 2400 MHz to 2500 MHz, while the range of the second frequency band is, for example, from 5150 MHz to 5850 MHz.

[0067] The first antenna element 300 is a loop antenna. Specifically, the first antenna element 300 utilizes left-handed material technology via these slots 331A to reduce its size, even by more than half, in the low-frequency operating range. The second antenna element 400 is an all-loop antenna. Specifically, the feed signal is transmitted via radiating branches 410 to a first arc-shaped radiating plate 420 at a quarter wavelength (corresponding to the second frequency band) and coupled to a second arc-shaped radiating plate 430, allowing the second antenna element 400 to radiate electromagnetic waves independently of those radiated by the first antenna element 300, and at a higher frequency than those radiated by the first antenna element 300. These radiating branches 410 achieve impedance matching via these bends 414A.

[0068] Since the first arc-shaped radiating plates 420 and the second arc-shaped radiating plates 430 surround the feed element 500, the second antenna element 400 generates a horizontally polarized omnidirectional field pattern through the complementarity of the field patterns. Therefore, the dual-band antenna 100A can operate in a first frequency band and a second frequency band via the first antenna element 300 and the second antenna element 400, and the first frequency band and the second frequency band can be changed by independently adjusting the structure of the first antenna element 300 and the second antenna element 400.

[0069] Furthermore, such as Figure 1 , Figure 3 and Figure 4 As shown, the radius r1 of both the first surface 210 and the second surface 220 of the substrate 200 can be 18.5 mm. In the first antenna element 300, the radius r2 of the feed radiator 310 can be 7.3 mm. The length l1 and width w1 of each transmission radiator 320 can be 5.8 mm and 4.75 mm, respectively. The width w2 of the annular radiator 330 can be 2.4 mm. The length of the slot 331A and the central angle θ1 corresponding to the first surface 210 can be 10 degrees.

[0070] In each radiating branch 410 of the second antenna element 400, the width w3 of the first extension 411, the second extension 412, the third extension 413, and the bent section 414A is 0.5 mm. The lengths l2, l3, and l4 of the first extension 411, the second extension 412, and the third extension 413 can be 2.8, 9.2, and 1.1 mm, respectively. The length la from the crest to the trough of the bent section 414A can be 7.5 mm, and the length ld of the bent section 414A can be 4.5 mm. The width w4 of the first arc-shaped radiating plate 420 and the second arc-shaped radiating plate 430 can be 2.35 mm. The central angle θ2 corresponding to the length of each third extension 413 to the connected first arc-shaped radiating plate 420 can be 36 degrees. The central angle θ3 corresponding to the length of each second arc-shaped radiating plate 430 to the second surface 220 can be 43 degrees.

[0071] Figure 5 This is a top view of a dual-band antenna 100B according to another embodiment of the present invention, and Figure 6 and Figure 7 They are respectively Figure 5 A schematic diagram of the first antenna element 300 and the second antenna element 400 of the dual-band antenna 100B. (See attached diagram.) Figures 5 to 7 , Figure 5 The dual-band antenna 100B is similar to Figure 1 The dual-band antenna 100A, wherein components with the same or similar functions are designated by the same number. The difference lies in that, in the first antenna element 300 of the dual-band antenna 100B, the opening cross-section of the slot 331B in the normal direction (parallel direction Z) of the first surface 210 is serrated. Furthermore, in the second antenna element 400 of the dual-band antenna 100B, the bent segment 414B of each radiating branch 410 is serrated in the normal direction (direction Z) of the second surface 220. The bent segment 414B has a plurality of serrated portions 417. Each serrated portion 417 has an endpoint, and any two adjacent endpoints are located on opposite sides of the connection between the first extension 411 and the second extension 412. Figure 5 In the example, the bent segment 414B has two serrated portions 417.

[0072] Similarly, the feed signal is transmitted via feed element 500 to first antenna element 300 and second antenna element 400. First antenna element 300 can be excited to radiate electromagnetic waves in a first frequency band, while second antenna element 400 can be excited to radiate electromagnetic waves in a second frequency band. The first frequency band ranges, for example, from 2400 MHz to 2500 MHz, and the second frequency band ranges, for example, from 5150 MHz to 5850 MHz. First antenna element 300 also utilizes left-handed material technology through these slots 331B to reduce its size at lower operating frequencies. In second antenna element 400, these radiating branches 410 also achieve impedance matching through these bends 414B.

[0073] Furthermore, such as Figures 5 to 7 As shown, in the first antenna element 300, the length of the slot 331B at the central angle θ1' corresponding to the first surface 210 can be 7 degrees. In each radiating branch 410 of the second antenna element 400, the lengths l2', l3', and l4' of the first extension 411, the second extension 412, and the third extension 413 can be 3.8, 10.2, and 1.1 mm, respectively. The length la' between the two ends of the bent section 414B can be 6.5 mm, and the length ld' of the bent section 414B can be 2.5 mm. The length of each third extension 413 to the connected first arc-shaped radiating plate 420 at the central angle θ2' corresponding to the second surface 220 can be 36 degrees. The length of each second arc-shaped radiating plate 430 at the central angle θ3' corresponding to the second surface 220 can be 43 degrees.

[0074] In summary, the dual-band antennas 100A and 100B of this invention, via the first antenna element 300 and the second antenna element 400, can operate in the first and second frequency bands. Furthermore, the first and second frequency bands can be changed by independently adjusting the structure of the first antenna element 300 and the second antenna element 400. Moreover, the first antenna element 300 can utilize left-handed material technology via slots 331A and 331B, thereby reducing its size in the low-frequency band. This not only significantly saves the volume of the dual-band antennas 100A and 100B but also maintains the antenna radiation efficiency characteristics of the dual-band antennas 100A and 100B in both the first and second frequency bands.

[0075] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A dual-band antenna, characterized in that, Include: The substrate includes opposing first and second surfaces; A first antenna element, operating in a first frequency band and disposed on the first surface, the first antenna element comprising: Feed radiation plate; A plurality of transmitting radiating plates are connected to the feed radiating plate, and each of the plurality of transmitting radiating plates extends outward from the feed radiating plate in a direction away from the feed radiating plate, and has a remote end away from the feed radiating plate. as well as An annular radiating plate is connected to the plurality of remote ends and has a plurality of holes and slots, wherein the feed radiating plate and the plurality of transmission radiating plates are located within the annular radiating plate, and each of the plurality of holes and slots is serrated or semi-sine wave shaped. The second antenna element operates in the second frequency band and is disposed on the second surface; as well as The feed element includes a feed section and a ground section, wherein the feed section is electrically connected to the second antenna element and the ground section is electrically connected to the feed radiating plate.

2. The dual-band antenna as described in claim 1, characterized in that, The number of the plurality of slots is the same as the number of the plurality of transmission radiation plates.

3. The dual-band antenna as described in claim 1, characterized in that, The feed radiation plate is circular in shape, and the plurality of transmission radiation plates are connected to the circumference of the feed radiation plate at equal intervals.

4. The dual-band antenna as described in claim 1, characterized in that, The second antenna element includes: Multiple radiating branches, each of the multiple radiating branches including a first extension segment, a second extension segment, a third extension segment, and a bent segment, and having a feed end and a connecting end, wherein in each of the multiple radiating branches, the first extension segment and the second extension segment extend in the same direction, the third extension segment and the second extension segment extend in different directions, the bent segment connects between the first extension segment and the second extension segment, and the second extension segment connects between the bent segment and the third extension segment, the feed end is located at the end of the first extension segment away from the bent segment, and the connecting end is located at the end of the third extension segment away from the second extension segment, and in the multiple radiating branches, the multiple feed ends are connected to each other and connected to the feed portion; Multiple first arc-shaped radiating plates are respectively connected to the multiple connecting ends; as well as Multiple second arc-shaped radiating plates are located between two adjacent third extension segments and are separated from the multiple first arc-shaped radiating plates. The shapes of the multiple first arc-shaped radiating plates and the multiple second arc-shaped radiating plates form a ring with multiple notches.

5. The dual-band antenna as described in claim 4, characterized in that, In each of the plurality of radial branches, the bent segment is sine-wave shaped.

6. The dual-band antenna as described in claim 4, characterized in that, In each of the plurality of radial branches, the bent segment is serrated in shape, the bent segment has a plurality of serrated portions, each of the plurality of serrated portions has an endpoint, and any two adjacent of the plurality of endpoints are located on opposite sides of the connection between the first extension segment and the second extension segment.

7. The dual-band antenna as described in claim 4, characterized in that, The number of the plurality of first arc-shaped radiating plates, the number of the plurality of second arc-shaped radiating plates, and the number of the plurality of transmission radiating plates are all the same.

8. The dual-band antenna as described in claim 4, characterized in that, The feed ends of the plurality of radiation branches are aligned with the central region of the feed radiation plate.

9. The dual-band antenna as described in claim 4, characterized in that, Each of the plurality of first arc-shaped radiating plates has a first arc length, and the plurality of first arc lengths are all equal. Each of the plurality of second arc-shaped radiating plates has a second arc length, and the plurality of second arc lengths are all equal.

10. The dual-band antenna as described in claim 4, characterized in that, The distance between any two adjacent connection ends is equal.

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